the other day i purchased some beer bottles from a guy on craigslist. He said that they were old (20+ years) They are all coors and budwieser bottles (some even remain unopened) My question is should I be using these for my homebrew? I feel a little sad taking the labels off such old bottles. Should i be keeping them for any reason, or just treat them like any other bottle?

I have a few old stroh's bottles and cans, and I have them on a shelf in my "drinking room", along with other relics (a 100yr old wood crate from an Upper Peninsula brewery that died from Prohibition).

Bottles are not that hard to get, and are cheap if you drink a lot of craft beer like me. Use other bottles, not the old ones.